... Format of Reader Wiegand 26 (All card reader with compatible protocol, such as Motorola , HID , EM ,Mifare one ... N denotes q ' ty of computer serial prot or q ' ty of 485hub port, support 256pcs ports ... Distance less than 13m, suggestion distance is 3m or less RS485: bus line max length 1200m, suggestion ... length 1000m or less, if expansion device added, the distance ...